NZ720850B2 - Paper sheet and a process for the manufacture thereof - Google Patents
Paper sheet and a process for the manufacture thereof Download PDFInfo
- Publication number
- NZ720850B2 NZ720850B2 NZ720850A NZ72085016A NZ720850B2 NZ 720850 B2 NZ720850 B2 NZ 720850B2 NZ 720850 A NZ720850 A NZ 720850A NZ 72085016 A NZ72085016 A NZ 72085016A NZ 720850 B2 NZ720850 B2 NZ 720850B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- paper sheet
- particles
- nano
- clay
- clay nano
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract 11
- 238000004519 manufacturing process Methods 0.000 title claims 2
- 239000002105 nanoparticle Substances 0.000 claims abstract 39
- 239000004927 clay Substances 0.000 claims abstract 26
- 239000000463 material Substances 0.000 claims abstract 16
- 229920002472 Starch Polymers 0.000 claims abstract 11
- 239000008107 starch Substances 0.000 claims abstract 11
- 235000019698 starch Nutrition 0.000 claims abstract 11
- 239000002657 fibrous material Substances 0.000 claims abstract 3
- 229920002678 cellulose Polymers 0.000 claims 6
- 239000001913 cellulose Substances 0.000 claims 6
- 239000013055 pulp slurry Substances 0.000 claims 5
- 229920001131 Pulp (paper) Polymers 0.000 claims 4
- 239000000203 mixture Substances 0.000 claims 4
- 239000012802 nanoclay Substances 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- 239000002002 slurry Substances 0.000 claims 1
Abstract
The present invention aims to provide paper sheet with improved creep resistance and ring crush strength. The present invention relates to a paper sheet and a process for making the paper sheet by bonding clay nanoparticles to a base material that includes at least two of fibrous material, cellulosic material or starch material.
Claims (25)
1. A paper sheet including a base material and clay nano- particles bonded to the base material, wherein the base material 5 includes at least two of fibrous material, cellulosic material or starch material, and the clay nano-particles are bonded to the base material to form a paper sheet having improved creep resistance and ring crush strength compared to a paper sheet having no nano-particles. 10
2. The paper sheet according to claim 1, wherein the nano- particles are a combination of clay nano-particles and cellulose nano-particles.
3. The paper sheet according to claim 2, wherein the clay nano- particles are present in the paper sheet at a weight in the 15 range of 2.0 to 20.0gsm.
4. The paper sheet according to either claims 2 or 3, wherein the cellulose nano-particles are present in the paper sheet at a weight in the range of 2.0 to 20.0gsm.
5. The paper sheet according to any one of the preceding claims, 20 wherein the clay nano-particles have a size in the range of equal to, or less than 500nm.
6. The paper sheet according to any one of the preceding claims, wherein the clay nano-particles are platelets having a thickness in the range of 0.5 to 5.0nm and a diameter in the range of 0.1 25 to 10.0µm.
7. The paper sheet according to any one of the preceding claims, wherein the paper sheet includes starch, clay nano-particles and cellulose nano-particles, in which the weight ratio of clay nano-particles to cellulose nano-particles is in the range of 10 30 to 90 : 90 to 10 respectively.
8. The paper sheet according to any one of the preceding claims, wherein the clay nano-particles are absent from at least one outer face of the paper sheet. 20154173_1 (GHMatters) P103274.NZ
9. The paper sheet according to any one of the preceding claims, wherein the clay nano-particles are present on at least one outer face of the paper sheet.
10. The paper sheet according to any one of the preceding 5 claims, wherein the clay nano-particles are distributed throughout the paper sheet.
11. The paper sheet according to any one of the preceding claims, wherein the paper sheet has at least two ply layers and the clay nano-particles are present in only one of the ply 10 layers.
12. The paper sheet according to any one of the preceding claims, wherein the paper sheet has at least one outer ply layer and at least one inner ply layer, and the clay nano-particles are absent from an inner ply layer of the paper sheet. 15
13. The paper sheet according to any one of the preceding claims, wherein the addition of clay nano-particles and starch increases creep resistance of the paper sheet compared to the paper sheet having no nano-particles by up to 115%.
14. The paper sheet according to any one of the preceding 20 claims, wherein the addition of clay nano-particles and starch increases the ring crush strength of the paper sheet compared to the paper sheet having no nano-particles by up to 108%.
15. The paper sheet according to any one of the preceding claims, wherein the paper sheet includes a combination of 25 starch, cellulose nano-particles and clay nanoparticles and the high humidity load carrying capacity ranges from 112 to 125% relative to the paper sheet having starch only.
16. The paper sheet according to any one of the preceding claims, wherein the paper sheet includes a combination of 30 starch, cellulose nano-particles and clay nanoparticles and the ring crush strength ranges from 112 to 125%.
17. The paper sheet according to any one of the preceding claims, wherein the paper sheet may include from 50% to 100% 20154173_1 (GHMatters) P103274.NZ recycled fibres yet retain the same creep resistance as the paper sheet made from virgin fibres.
18. A process of manufacturing a paper sheet, the process including the steps of: 5 forming the paper sheet including one or more than one ply layer comprising a base material including two or more of fibrous material, cellulosic material or starch material; forming a mixture including clay nano-particles; and adding the mixture to the paper sheet, 10 such that the mixture is bonded to the base material to form a paper sheet having improved creep resistance and ring crush strength compared to a paper sheet having no nano- particles. 15
19. The process according to claim 18, wherein the mixture includes starch.
20. The process according to either claim 18 or claim 19, wherein forming the paper sheet includes mixing fibrous 20 material, cellulosic material or starch material so as to form a paper pulp slurry and delivering the slurry onto a travelling wire at the wet end of a paper making machine, and adding the clay nano-particles to the paper pulp slurry includes adding the clay nano-particles into the pulp slurry.
21. The process according to any one of claims 18 to 20, wherein the clay nano-particles are added to a paper pulp slurry feed to a headbox of a papermaking machine so that the clay nano- particles are distributed through a ply layer that is delivered 30 by the headbox onto the travelling wire.
22. The process according to any one of claims 18 to 21, wherein the clay nano-particles are contained in a liquid that is sprayed onto face of one or more ply layers on a wire at the wet 35 end of the paper machine. 20154173_1 (GHMatters) P103274.NZ
23. The process according to any one of claims 18 to 22, wherein incorporating the clay nano-particles into the paper pulp slurry includes applying the clay nano-particles to the paper sheet 5 after ply layers of the paper sheet have been joined together.
24. The process according to any one of claims 18 to 23, wherein the clay nano-particles are applied to the paper sheet in a size press.
25. The process according to any one of claims 18 to 23, wherein the clay nano-particles are applied to the paper sheet by meter press roll. 20154173_1 (GHMatters) P103274.NZ
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2015902153A AU2015902153A0 (en) | 2015-06-03 | Paper sheet and a process for the manufacture thereof | |
| AU2016901174A AU2016901174A0 (en) | 2016-03-30 | Paper sheet and a process for the manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ720850A NZ720850A (en) | 2024-02-23 |
| NZ720850B2 true NZ720850B2 (en) | 2024-05-24 |
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